linux-kernel - Re: [PATCH] replace deprecated RW_LOCK

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Message-ID: <alpine.DEB.1.10.0812101359030.11805@gandalf.stny.rr.com>
Date:	Wed, 10 Dec 2008 14:00:44 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Eric Dumazet <dada1@...mosbay.com>
cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	"David S. Miller" <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH] replace deprecated RW_LOCK_UNLOCKED in
 net/dccp/proto.c


On Wed, 10 Dec 2008, Eric Dumazet wrote:

> cced netdev

Thanks,

> 
> Steven Rostedt a ?crit :
> >  
> >  struct inet_hashinfo __cacheline_aligned dccp_hashinfo = {
> > -	.lhash_lock	= RW_LOCK_UNLOCKED,
> > +	.lhash_lock	= __RW_LOCK_UNLOCKED(dccp_hashinfo.lhash_lock),
> >  	.lhash_users	= ATOMIC_INIT(0),
> >  	.lhash_wait = __WAIT_QUEUE_HEAD_INITIALIZER(dccp_hashinfo.lhash_wait),
> >  };
> > --
> 
> Hum... this rwlock doesnt exist anymore on net-next-2.6, all this stuff
> was converted to RCU for upcoming 2.6.29
> 
> struct inet_hashinfo dccp_hashinfo;
> EXPORT_SYMBOL_GPL(dccp_hashinfo);
> 
> I guess such a patch wont ease David job when 2.6.29 merge window opens

One of the requirements in the new rt git tree is that all rwlocks must 
use the __RW_LOCK_UNLOCK(lock) macro. I had to fix it in our tree, but 
whenever I do a clean up patch, I like to share it ;-)

-- Steve

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